Jack Goldberg wrote:
>
> Hi,
>
> If you input Del[x] you get as output "inverted-delta"[x].
> I would like to incorporate a similar feature in a package I
> am writing, to wit,
>
> The output of Chi[x,a,b] should be "Greek-lowercase chi"[x,a,b].
>
> This must be very easy but I have not found reading these sections in
> the Book very helpful. Thanks ..
>
> jack
Hi,
Format[Chi[a_, b_, c_], StandardForm] := "Greek-lowercase chi"[a, b, c]
will do what you want.
The more powerfull and modern version in the FE is
MakeBoxes[Chi[a_, b_, c_], fmt_:StandardForm] :=
RowBox[{"a strange name with \[Chi] and \[SpaceIndicator] in it",
"[",
ToBoxes[a, fmt], ";", ToBoxes[b, fmt], "|", ToBoxes[c], "]"}]
Hope that helps
Jens